[Galaxy Note 4 Q&A, Help & Troubleshooting] HmanA6399:
[FIX] Note4 Exynos N910C bootloop problem + Invalid IMEI "Network" problem FIXED!

Hi Guys....​

First of all, I'd like to CREDIT:-

1- FR34K-B1B0 to whom I owe the idea. Man, you really powered me on :) :fingers-crossed: :good:

2- h311sdr0id who created Ext4Unpacker tool.

3- lyriquidperfection

for his great EFS Professional tool.

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Many members threaded the problem of Note 4 N910C Exynos version bootlooping when they tried to get back to stock 5.1.1 from a custom CM13 ( or any custom based on 6.0 ). I've been suffering the same problem for 2 weeks.

After tons of internet gigs consumed, cups of coffee drunk, and hours wasted :crying: , I found this solution :victory: ; which I really hope it'll help. ;)

Let's start

​

Phone Status:

*Custom rom based on 6.0 // **rooted // *** busybox installed "smart install" // **** TWRP custom recovery.

Computer Requirements:

*Win7 or higher "I'm using Win10" // **Samsung USB Drivers // ***adb-Drivers ( download SDK Tools, install "platform tools " and "Google adb Drivers" Packages. To test it, run the command

adb drivers

in the folder where the packages are installed ) // **** EFS-Professional

STEPS[/FONT]

STEP1:

Through TWRP, make a full backup; then copy this backup ( you should find it in the folder /TWRP/BACKUPS/(some no.s)/(your backup name) in your phone's internal storage ) to your computer, rename the backup "6.0". This backup has an EFS folder which isn't compatible with stocks lower than 6.0, but its IMEI is the right one of your phone (keep this in mind).

STEP2:

a- In your phone - rooted and having busybox installed - apply USB-Debugging and grant root access to adb (for CM13 Users, it's a feature you can find in Developer options settings)

b- Connect your phone to the computer, then open EFS Professional ( you should receive a msgbox in your phone; check "Always allow this computer"; then click "OK"or whatever..... )

TIP: if you face a problem opening EFS-Prof., try restarting it, if not solved, make sure that: *You allowed the computer (msgbox of the phone)// **Your device is rooted// ***Your device have busybox Pro fully installed.

c- When EFS-Pro loads, choose the 3rd tab "Samsung tools" , surf to "other tools" and choose "Format EFS Folder" then click "Execute"

TIP: If a msgbox appears saying that permission is denied, it doesn't matter at all, only click "Execute" again, it'll tell you "Can't find mount points" this means it's done :)

d- REBOOT IMMEDIATELY INTO RECOVERY ( NEVER REBOOT INTO SYSTEM TELL YOU END STEP3 )

STEP3:

a- In TWRP, wipe all except internal storage and microSD

b- power off your phone after the wipe ( if TWRP asked to install SuperSU, refuse )

c- Open in download mode

d- In Odin, Load the pit file of your phone ( search google for one if you doesn't have any ) then load the stock in AP ( mine is COJ5 Brasil VIVO ). Check "Repartition" then Start.

CONGRATS :victory: :victory: ,YOU'RE NOW ON STOCK​

Unfortunately :( :( , Your IMEI now isn't the one your phone really has, so you're not registered on a network. Don't Panic ;) We're going to solve it :D .

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IMEI Fix​

Requirments

: *Your phone on stock 5.1.1 // **The same computer // ***The Backup we made above in STEP1 ( its folder in the computer should be named "6.0" )// ****Root Explorer app for your phone// *****Ext4Unpacker tool for ur computer

STEPS:-

STEP1:

Root n' TWRP

STEP2:

Full Backup in TWRP

STEP3:

Move the backup to your computer, rename it "5.1.1" and save it in the same folder you saved the "6.0" Backup ( keep in mind that this backup "5.1.1" is the one compatible with stocks but having invalid IMEI ). Now you have a main folder containing 2 subfolders called "5.1.1" "6.0" which are the 2 backups

STEP4:

In this main folder make a new folder "EFS PORT", inside it make 2 new folders "BASE" & "PORT"

STEP5:

Using Ext4Unpacker tool, extract "efs1.emmc.win" of the "5.1.1" backup into the "BASE" folder. In the same method, extract "efs1.emmc.win" of the "6.0" backup into the "PORT" folder. Now you have "EFS PORT" folder containing "BASE"&"PORT" each having an EFS.

STEP6:

Delete "imei" folder of "BASE" EFS and replace it with the one in "PORT" EFS.

STEP7:

Connect your phone to the computer, Copy the "BASE" folder to it and rename it "efs" (small letters NOT CAPITAL).

STEP8:

In your phone; install Root Explorer App. and grant its access to hte root (the msgbox SuperSU will send you)

STEP9:

Using root explorer, surf to /efs folder of your phone's root directory ( it'll refuse to delete the folder but its components will be deleted ), then replace it with the one you copied from your computer.

STEP10:

Reboot the Phone (don't Panic if it bootloops once or twice)

CONGRATS :victory: :victory: . IT'S FIXED NOW AND NETWORK IS ALIVE AGAIN, ENJOY!

PM ME FOR ANY PROBLEM OR QUESTION​

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